PLC programming steps with analytical method

Principles of uniqueness to the design of ladder diagram, or PLC programming increased constraints, starting with design and programming but also to bring ideas.The analytical program described here is to start from the principle of analysis only, specific steps are:1) column to the original source for the meter: according to the PLC the object of … Continue reading PLC programming steps with analytical method

Mitsubishi FX2N series PLC pulse output commands PLS/PLF

① PLS Pulse rise time differential output directive, PLF is a pulse differential output decline. PLS and PLF command can only be used for the output relay y and auxiliary relay m (does not include special auxiliary relays).② M0 X0 normally open from open to close (X0 rising edge) when a scan cycle for ON;M1 … Continue reading Mitsubishi FX2N series PLC pulse output commands PLS/PLF

Mitsubishi FX2N series PLC pulse contact instructions LDP/LDF/ANDP/ANDF/ORP/ORF

① LDP, ANDP and ORP directive is used for the rising edge detection of contact orders, contact with an upward arrow in the Middle, the corresponding contact only at the rising edge of the specified element (from OFF to ON), through a scanning cycle.② LDF, ANDF and ORF falling edge detection is the instruction for … Continue reading Mitsubishi FX2N series PLC pulse contact instructions LDP/LDF/ANDP/ANDF/ORP/ORF

PLC ladder diagram Conversion design method

Conversion design method of relay diagram is converted with the original function within the same PLC ladder diagrams. This equivalent conversion is a simple shortcut of programming method, conversion method of advantages many, one, original following electrical control system after long-term using and test, has was proved can completed system requirements of control function; second, … Continue reading PLC ladder diagram Conversion design method

PLC Mitsubishi FX2N series general-purpose timers

100ms timer set value set value from 0.01s~327.67s;1ms for 0.1s~3276.7s;10ms timer set timer value from 0.001s~32.767s.When X0 is switched on, the address number for the T200 the current value of the counter counts the number of 10ms clock pulse when the set value when K123, the normally open contact of the timer switched on, disconnect … Continue reading PLC Mitsubishi FX2N series general-purpose timers

Mitsubishi FX2N series PLC totalizer type timer

When the timer winding T250-driven input X0 is switched on, the T250 is the current number of clock pulses the counter starts accumulating 100ms, K123 when the set values are equal, the normally open contact of the timer switched on, disconnect the normally closed contact. When the count intermediate driver input X0 disconnect or power … Continue reading Mitsubishi FX2N series PLC totalizer type timer

SIEMENS S7-300 PLC CPU module component

S7-300 there are many different types of CPU, suitable for different levels of control. CPU module is integrated with the digital I/O, and integrated digital I/O and analog I/O.CPU component is packaged in a sturdy and compact plastic enclosure, Panel on the status and error indicator LED, mode selection switch and communication interfaces. Micro memory … Continue reading SIEMENS S7-300 PLC CPU module component